Whipstock



April 19, 1927'.A n'

F. l. GETTY wHIPsT'ocK LFiled April 6, 1926.

L Patented 1927. ,1 l 4 Y UNITED STATES PATENT OFFICE.

:man I. Garry, or JnNNmes, Louisiana.

I wnms'rocx.

application mea April e, 192e. sei-m1 no. 100,112.

The invention relates to whi stocks and has as an object tovimprove-:tye form 'of whipstock shown by the patent granted to me July 22, 1924,No. 1,502,428. It is an object of the present inventlon to provide awhipstockwhich shallbe more simple than that shown in my prior patent.It is a further object of the invention to provide a guiding surface forthe cutting tool which shall result in a clean cut being formed in thewall of the well casing.

Further objects of the invention will appear from the followingdescription when read' in connection with the accompanying drawingsshowing an illustrative embodiment of the invention' and wherein:

Figure 1 is a vertical section of the device upon its introduction intoa well casing,

- Figure 2 is a like sectionl ofthe device as being seated in thecasing,

Figure 3 is an enlarged detail section of `the device seated in thecasing and showing the cuttingtool adapted to cooperate there- A with indotted lines in its position adjacent the termination of the cut,

.Figure 4 is a horizontal section to an enlarged scale taken on line 4-4of Figure 2;,

Figures 5 and '6 are horizontal sections respectively on lines 5-5 and6-6 of Fig- .ure 3,

Figure 7 is aside elevation of the wedge member.

As shown the .device comprises an elongated "generally cylindrical body10 havingl an elongated concave surface l1 extending throughout a greatportion of its length, the whipstock when the device is seated in thecasing 12 forming an inclined surface extending from side to side of thecasing.

To seat the whipstock in the well casing, the same is adapted to hesuspended as by mensgof the drill stem, having at its bottom end a rod13 secured to the whipstock by means of a bolt`14 engaging a threadedopening 15 in the. whipstock. When the whipstock has been lowered to itsseating po- 1 sition it may be firmly seated and the bolt 14 maybesheared by lowering the wholeA device into place, whereupon the weightof the rod 13 and the drill stem will cause shearing of the boltf14. Theend of the rod 13 may be formedl for purposes of retrieving the shearingportion of thebolt 14 inthe manner shown by myA former patent abovereferred to.

The whipstock as a whole is so formed 1n outline that thefportionthereofrbelow the point 16 where the concave surface 11 terminates isinclined away from that side of the whipstock in order that when thewhipstock 1s seated the portion 16 will first contact with the wall ofthe casingy inl order to draw the upper end of the whipstock into closeengagement with 'the opposite side of the interior of the casing.

To cause the engaging .action above referred to there is shown awedge-shaped member 18 preferably formed with spaced ribs 19 and 20 ofless height at their upper ends 21 than at their lower ends 22, thewedge also comprising a web portion 23 havingla longitudinal slot 24formed there- 1n.

`To coact with the wedge 18 the lower end of the whipstock yis shown asenlarged at 25 and flattened at its rear portion, the Hat-y tened ortionbeing upwardly inclined away from t e forward surface 26 thereof. A capscrew 27 is shown loosely engaging the slot 24 and takinginto a threadedsocket 28 in the end'25 of the whipstock. To hold the wedge in itsextended position during the operation of lowering the device into awell v whipstock. In the action of the seating of the device this capscrew also will be sheared allowing, the cap screw 27 to pass downwardlyin the slot 24 thus wedging the lower end of the whipstock overin thecasing by coaction of the inclined surface 32 of the whipstock with theface of the wedge 18.

For an engagement with a pipe or other object in place in the well andto provide resistance to bring about the wedging action described, thelower end of the wedge 18 is shown with an enlarged head 33.

At times it is" desired to seat the whipstock in the well at some'distance above the packer or liner of the well, the head 33 is thereforeshown socket 34 adapte to beplaced into screwthreaded engagement with acoupling member to which is suspended a string of pipe 35 of any desiredlength in accordance with the location at which it is desired to seatthe' rotided with an internal shown as sloping uniformly from side toside of the Well casing. With this form of wedge it is found that thecutting tool such as shown in dotted lines at 36 of Figure 3 is liableto jump when the cut is almost completed whereby to leave a rough marginto the opening upon which a liner or strainer which it is desired tolower through the opening will catch. According to the present inventionthis ditiiculty is avoided by the form of surface shown, in Figure 3wherein the lower termination of the surface 11 is in the form of anabrupt curve 37. When so formed it is found that the cuttin tool will beheld in firm engagement with t e whipstock until the opening in thecasing has been cleanly cut through with no resulting difficulties inthe passage of the liner or strainer.

The provision of the ribs 19 and 20 provide in connection with thefiattened rear surface of the portion 25 a three point bearing of thewedging means whereby the whipstock will be accurately forced toward thedesired side of the well casing.

Minor changes may be made in the physical embodiment of the inventionwithout departing from its spirit.

I claim:

1. A whipstock comprising an elongated body adapted to be rigidly seatedin a well casing, sald body comprising a tapered portion, a concavesurface carried by said tapered portion extending substantially fromside to side of the interior of the casing when the tool is seatedtherein, said surface terminating at its lower end in. an abrupt outwardcurve whereby to maintain contact with the cutting tool.

2. A whipstock comprising, in combination, an elongated -body having atapered upper portion provided with a concave tool engaging surface, andan oppositely tapered lower portion, a wedge ceac-ting with said lowerportion, se arated upwardly dimin ishing ribs carried to contact withthe interior of a well casin and means for slidably associating saiwedge with said lower portion.

3. A whipstock comprisin in combination an elongated body having a taered portion provided with a concave too engaging surface, a wed esurface carried by the lowerY` extremity 0% said body, a wedge slidablyassociated with said last named surface, an enlarged head carried by thelower end of said wedge provided with an internally screwthreadedsocket, said wedge provided with spaced upwardly diminishing rearwardldirected ribs.

4. A w ipstock com rising, in combination, an elongated bo y having atapered portion provided with a tool-enga 'n surface, a wedge surfacecarried b t e ower extremity of said body, a we ge slidably associatedwith said last named surface, the said wed e having an enlarged headinwardly o set from the body 'of the wedge.

5. A whipstock comprising, in combination, an elongated body havin atapered portion provided with a too engaging surface, a wedge surfacecarried by the lower end of said body, a wedge slidably associated withsaid last named surface and means to attach said wedge to a string ofpipe.

6. A whipstock comprising, in combination, an elongated body having a'tapered portion provi ed with a tool enga 'n Vsurface, a wedge surfacecarried by t e ower end of said body, a wedge slidably associated withsaid last named surface, the said wedge being threaded at its lower end.

Y FRED I. GETTY.

by said wedge adapted l

